Sand-blast machine



' Nov. 27, 1928.

E. A. RICH, JR, ET AL SAND BLAS 1' MACHINE Sheets-Sheet Filed Jan. 14, 1924 Z02 iness Nov. 27, 1928. 1,692,864

" E. A. RICH, JR, ET AL SAND BLAST MACHINE Filed Jan. 14, 1924 -5,SheetsSheet 3 I fizz/67545115! I Nov. 27, 1928.

Illllllll Nov. 27, 1928.

E. A. RICH,, JR., ET AL SAND BLAST MACHINE gled Jan. 14, 1924 5 Sheets-Sheet 5 J5 J3 J5 15 Patented Nov. 27, 1928;

PATENT OF F ICE...

UNITED STATES I ELMER A. RICH, JR.,. AND RAYMOND H" MOORE. 02E CHICAGO, ILLINOIS.

SAND-BLAST MACHINE.

Application filed January 14, 1924. Serial No. 686,234.

Our invention relates to sand blast machines, and particularly to a type of ma chine in which the castings or other articles to be treated are subjected tothe action" of the sand blast while inside of a rotary member such as a casing or barrel.

One of the objects-oi the invention is to provide a simple, practical. and advantageous machine of the class specified. I

I Another object of" the invention isto arrangefor the automatic return of the sand used in the sand bl-ast for successive reuses.

Another object of the invention is to provi de simple and practical" means for thus automatically returning the sand for reuse.

Another object of the invention is to se cure simplicity of construction andinexpensiveness of manu'facture and operation.

In the accompanying drawings Fig; 1' 1s a perspective view oi a sand blast machine embodying our present invention;

Fig. 2 is a View of the same with the outer casing of the rotary member practicallyremoved;

Fig. 3 is alongitudinal section of the machine;

Figs. 4 and 5" are cross sections taken on lines 4-4: and 5-5, respectively, in Fig. 2; and 1 Figs. 6" and 'Tare views of details ofconstruction of the barrelbearings and sand blast mixing means respectively.

Referring tothe drawings, we show a ma chine embodying end supporting members 1 and 2, and a rotary barrel or casing member 3 extending between and supportedby the end members 1 and 2.

The-rotary member S'is mad'ef hollow so as to contain the castings which are to" be treated or sand blasted by themachine, and

while said rotary member could have various shapes 1t is preferably g venan octagonal or other polygonal form or shape, whereby it may be made of a series of flat plates instead of'being made of' a circularor cylindric form, with the advantage of simplicity and cheapness of construction.

The member 3 is also made Wlfilllllllel and outer walls or casings for purposes to be hereinafter explained, and to such end the outer casingismade ofa seriesof plates 6-6 and the inner casing of aseries of plates 7-7. The plates 6-6 are secured together along their edges so as to form the octagonal. shaped barrel, and one of them; namely the plate 8, is hinged at 9 so as to form a swinging door by which castings may be admitted to and taken. from the interior of the barrel. The inner casing is madeof the plates 7-7 and these are separated-from one another along their lengths so as. to form spaces 10-10 between their lengths and one of these plates 7 is also hinged at 9' so as..to cooperate with the outer casing plate 8 to form the door for' admitting the castings to be treated.

The sand introduced into the barrel or casing for treating the castings may escape through the spaces or slots 10-10 into the space or chamber 11 between the inner and outer barrels. Provision is made for gathering' this sand and returning'it automatically to position for reuse by the sand blasting apparatus.

In the arrangement shown there are vanes 12 mounted on theinner casing and secured to the strips or plates 7 thereof. These vanes are conveniently in the form of angle bars, one side of which is secured to plate 7, and they are arranged at an inclination or angle, as shown in Fig. 2, so that by the rotation of the barrel or casing'the sand which issues through the slots or. spaces 10-1-0 ings are being treated. When so tumbled ortossed through openings 13-13, the sand falls into spaces or pockets 16-16 and will fall upon vanes or shelves 17-17 (Fig. 5 in the space or chamber 1 8 at the right hand end of the barrel, beyond the partition 14, and will be raised by said shelves or vanes 17-17, as shown in Fig. 5-, and finally dumped or deposited on screens 19-19 which are located above an inner chamber 20 at the central portion of the right hand end of the barrel. The sand will remain in this chamber until picked up again by the sand blast mechanism for further use. Thus it will be seen that there will be a continual circulation of the sand in and through the barrel and back again for reuse, the sand being blasted into the barrel, then escaping through the longitudinal slots thereof, then dropping into the elevating apparatus at the right hand end of the barrel by which it is elevated and then again deposited into the reservoir space formed centrally of the barrel.

The rotary sand blast barrel. is preferably mounted in the manner shown by which its friction of rotation is much reduced, the arrangement shown consisting of trunnions at opposite ends of the barrel, the same being conveniently provided by castings secured to the opposite ends or heads 26 and 27 respectively of the barrel. These trunnions 25 are mounted on rollers 28--28, there being two rollers 28 for each trunnion 25 and the rollers 28 being preferably provided with ball bearings 29 so that their friction is reduced to a minimum, said bearings 29 being mounted on shafts 3030. Thus the sand blast barrel is provided with a very simple and advantageous anti-friction bearing arrangement.

The trunnions 25 are desirably made tubular or hollow, as shown, and the sand blast pipe 30 ispassed through the left hand bearing 25 3) and connected with an overhead sand blast nozzle pipe 31 provided with sand blast nozzles 3232, preferably arranged at intervals along said pipe 31. Pipe sections 33 and 34 support the pipe 31, the pipe 34 being extended to the bottom of sand reservoir 20 and provided with a bottom aperture 37 through which sand may pass from said reservoir, so that when the sand blast is on pipe 38 which forms a continuation of pipe 34, the blast will draw sand through aperture 37 and into pipe 34 and force it through the latter into pipe 31 and through nozzles 33 by which it will be directed against the articles under treatment in the rotary barrel. A gate valve 40 is preferably provided to control sand aperture 37 and this valve 40 in turn is controlled by rod 41 connected with valve 40 by a bell crank 42, which said rod 41 is extended through the end of pipe 38 and provided with a manually controlled handle 45 for controlling valve 40 and thereby controlling the amount of sand permitted to pass into sand blast pipe 34 and therefore into sand blast nozzles 32.

As an arrangement for driving the sand blast barrel, we show the latter provided with a gear 48 and gearing controlling the same, said gearing conveniently comprising a gear 50 meshing with gear 48 (Fig. 4), another gear 51, carried by shaft 52 carrying gear 50, another gear 53 meshing with gear 51 and another gear 54 carried by shaft 55 carrying gear 53. Still another gear 56 meshes with gear 54 and is carried by shaft other perforations 63 in end wall 64. Said casing is provided with a door 65 at its lower end by which the accumulated sand and grit and dust may be removed and the upper end of'said casing is open at 66 to form an outlet through which the spent sand blast air may pass.

It will be understood that changes and modifications may be made without departing from the spirit of the invention.

What we claim is: V

1. A sand blast machine comprising a rotary barrel provided with sand blast nozzles and feeding means for said nozzles at one end of the barrel, said feeding means comprising a sand reservoir located centrally at one end of the barrel anda sand blast pipe extending through the end of the barrel to said reservoir and thence to said nozzles, and means for collecting sand from the barrel and delivering it for reuse to said sand reservoir, said nozzles being interiorly arranged in the barrel and being supported in part by said air blast pipe and in part by another supporting member extended to the other end of the barrel.

2. A sand blast machine comprising a rotary barrel provided with sand blast nozzles and feeding means for said nozzles at one end, of the barrel, said feeding means comprising a sand reservoir located centrally at one end of the barrel and a sand blastpipe extending through the end of the barrel to' said reservoir and thence to said nozzles, and means for collecting sand from the barrel and delivering it for reuse to said sand reservoir, said nozzles being interiorly arranged in the barrel and being supported in part by said air blast pipe and in part by another supporting member extended to the other end of the barrel, said last mentioned end of the barrel having a tubular trunnion through which said supporting member eX- tends, said tubular member being in communication with the interior ofthe barrel to permit escape of extraneous matters.

3. A sand blast machine comprising a rotary barrel provided with interiorly arranged overhead sand blast nozzles, said barrel having its opposite ends provided with tubular trunnions, a sand reservoir at one end of the barrel, and means for collecting the used sand from the barrel and returning it to said reservoir for reuse, an air blast pipe downwardly and thence out the tubular trunextending through the tubular trunnion at nion at said end of the barrel. 1 10 the end of the barrel Where said sand res- In Witness whereof, We hereunto subscribe ervoir is located, said air pipe extending to our names this 8th day of January, A. D.,

* said reservoir and thence to the sand blast 1924:.

nozzles and in part supporting the latter, and Y a supporting member for the other end of the I ELMER A. RICH, J R. nozzles, said supporting member extending RAYMOND H. MOORE. 

